涡动相关法测量波文比的一个校准问题

A CALIBRATION PROBLEM IN APPLYING EDDY-COVARIANCE TECHNIQUE TO MEASURE BOWEN RATIO

涡动相关法是目前国内外研究碳循环的一种最可靠的微气象学方法;而波文比是反映生态系统能量状况的重要参量.应用涡动相关法实际测量波文比时,由于自然或人为原因,不同时间安装的传感器存在着测量偏差.如何确保测量数据的准确性关系到整个涡动相关-波文比系统的精度.本文基于内蒙古太仆寺旗实验站的实际情况,提出了一种通过回归关系用新传感器校准旧传感器的方法.结果表明,该方法能够有效地校准旧传感器所测数值.此外,本文还对校准过程中产生的统计检验、回归分析、仪器校准年限等问题作了进一步讨论.

The eddy-covariance technique is regarded as one of the most reliable microclimatology method in the studies of carbon cycle. Bowen ratio is an important parameter representing energy status of ecosystems. Sensor measurement errors, especially when they are installed at different time, exist in applying eddycovariance technique to measure Bowen ratio as a result of natural or man-made factors. Therefore,the precision of Eddy-covariance-Bowen ratio system is closely related to the accuracy of measured data. A new method of calibrating old sensor via new one through regression analysis is presented for the experimental station in Taipusi County, Inner Mongolia. Result shows that this method can adjust measured data of old sensor effectively. In addition, several other problems during the calibration, such as statistical tests, regression analysis, years needed to calibrate, are further discussed in detail.